A Methodology for Ultrasound Product Development Applications in HIFU and High Frequency
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1 A Methodology for Ultrasound Product Development Applications in HIFU and High Frequency Claudio I. Zanelli Samuel M. Howard Ultrasonic Industry Association 35 th Annual Symposium - San Diego, California March 13-14,
2 Outline Ultrasound Medical Devices the Challenges Device Development Process Outline of a Project Case Study: HIFU for fat ablation Case Study: High Frequency for Imaging Case Study: Ranging Catheter What we ve learned - 3 lessons 2
3 Ultrasound Medical Devices the Challenges Technology adoption by clinicians 3
4 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment 4
5 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment The Quick n Dirty catch 5
6 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment The Quick n Dirty catch Reproducibility of results 6
7 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment The Quick n Dirty catch Reproducibility of results Other technologies: RF, drugs, MRI, video 7
8 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment The Quick n Dirty catch Reproducibility of results Other technologies: RF, drugs, MRI, video Regulatory hurdles 8
9 Ultrasound Medical Devices the Challenges Technology adoption by clinicians Disposable vs. capital equipment The Quick n Dirty catch Reproducibility of results Other technologies: RF, drugs, MRI, video Regulatory hurdles The market, reimbursement, funding 9
10 Ultrasound Medical Device Challenges Adoption by Clinicians No time to learn new tricks 10
11 Ultrasound Medical Device Challenges Adoption by Clinicians No time to learn new tricks Minimal change from current procedure 11
12 Ultrasound Medical Device Challenges Adoption by Clinicians No time to learn new tricks Minimal change from current procedure Anything that will make it easier is OK 12
13 Ultrasound Medical Device Challenges The Quick n Dirty Catch Dilemma: 1. Concept requires quick and cheap proof 2. Build prototype cheap. Undesirable features will be fixed later. 3. Having prototype, do animal tests 4. Go for FDA approval (510k or PMA) 5. Go to production any changes will require redoing animal tests for FDA. (Oops!) 13
14 Ultrasound Medical Device Challenges Regulatory Fundamental Bioeffects Efficacy Safety Design Control Process Control Bureaucratic Documentation Design Control Process Control PMA or 510k backup 14
15 Development Project Outline Goal: Risk Reduction! Lay out the ground work Develop device and evaluate File patents Set up manufacturing wait for business success! 15
16 Development Project Laying out the ground work The IP landscape The biology landscape Modeling tools Prototyping available Measurements available Technology landscape 16
17 Development Project - Ground Work The IP Landscape Information search Patents database Literature journal articles Awareness networking Legal determinations Freedom to operate Technology protection 17
18 Development Project - Ground Work The Biology Landscape Tissue properties Acoustic Thermal Irreversible changes Ranges of variations model and human Anatomical Physiologic In vitro vs. in vivo Transferability across species Animal model not available for all conditions Diet matters Size matters 18
19 Development Project Project outline: Biology first and last 1. Determine the effect sought 2. Understand the tissue 3. Model the interaction 4. Design and model the beam 5. Design the transducer and system (Des. Control) 6. Test on repeatable (phantom) model 7. Measure 8. Iterate from 3 until confident with the physics 9. Test in tissue 10. Iterate from 2 until confident with the biology 11. Test in humans 12. Iterate from 2 until confident with the results 19
20 Modeling Sound in Tissue Experimental Live and excised tissue are very different Interceding tissue Bone (e.g. for brain) Fat Muscle layers Modeling issues Non-linearity (KZK) Acoustics affects thermal affects acoustics If heat matters, boundary conditions are key Beam entrance Perfusion 20
21 Case Study: HIFU for Fat Ablation Goal: Dissolve fat under skin IP status: patentable Biology: very complicated Tissue: skin, fat, muscle Success determined by heat, damage, resorption Huge anatomical variability Physics: Heat tissue to 50C, 4 seconds, mm deep Beam: F/1.2, 3 to 4 MHz, 30W max Transducer: water standoff for coupling and cooling Tests: phantom had to be developed 21
22 Case Study: HIFU Transducer Modeled and Built 22
23 Case Study: HIFU Location Problems 23
24 Case Study: HIFU Tissue Modeling, Effects on Gel 24
25 Case Study: HIFU Uniformity Problems Picture of non-uniform beam schlieren Picture of uniform beam schlieren 25
26 Case Study: HIFU Problem Beam Entrance Heating 26
27 Case Study: HIFU Surface Cooling 27
28 Case Study: HIFU Transducers and Drivers - Prototype 28
29 Case Study: HIFU Gel Burns 29
30 Case Study: HIFU Gel Burns 30
31 Case Study: HIFU Gel Burns 31
32 Case Study: HIFU Gel Burns 32
33 Case Study: HIFU Gel Burns 33
34 Case Study: HIFU Gel Burns 34
35 Case Study: HIFU Gel Burns 35
36 Case Study: HIFU Gel Burns 36
37 Case Study: HIFU Gel Burns 37
38 Case Study: HIFU Gel Burns 38
39 Case Study: HIFU Gel Burns 39
40 Case Study: HIFU Conclusions Tested in animal model Raised $27M Transferred for development in house Evolved, about to market 4 years later 40
41 Case Study: HF transducer for imaging Goal: transducer for imaging at 30 um axial res. Tissue: eye Beam: F/ MHz 3mm diameter Transducer: water standoff for coupling Tests: water echo 41
42 Case Study: High Frequency Imaging Modeling the Transducer 42
43 Case Study: High Frequency Imaging Generated Beam 43
44 Case Study: High Frequency Imaging Transducer and Image 44
45 Case Study: High Frequency Imaging Conclusions Device improves over previous type Funds unavailable On hold 45
46 Case Study: Ranging Catheter Goal: transducer on a catheter for axial ranging, 250 um axial res. Tissue target: pericardium Beam: defocused MHz 2.5mm diameter Transducer: direct contact with tissue Tests: Water is (acoustically) good enough Animals, humans 46
47 Case Study: Ranging Catheter Application 47
48 Case Study: Ranging Catheter Application 48
49 Case Study: Ranging Catheter Application 49
50 Case Study: Ranging Catheter Application 50
51 Case Study: Ranging Catheter Conclusions Enabling technology Successfully tested in humans Company merged with its competitor TMR technology fell in disfavor Product cancelled 51
52 What we ve learned - 1 Ultrasound medical device development presents multifaceted challenges that need to be addressed in an integrated, multifaceted approach 52
53 What we ve learned - 1 Ultrasound medical device development presents multifaceted challenges that need to be addressed in an integrated, multifaceted approach Lesson: Follow a disciplined product development and integrate all the details. 53
54 What we ve learned - 2 A good medical device requires doing the homework, yet successful medical products are rare. 54
55 What we ve learned - 2 A good medical device requires doing the homework, yet successful medical products are rare. Lesson: Do not discount the cost of development based on speculation of future sales 55
56 What we ve learned - 3 Medical device developers expect IP as part of the engineering work because IP is the most precious commodity, embodied in the engineering work. 56
57 What we ve learned - 3 Medical device developers expect IP as part of the engineering work because IP is the most precious commodity, embodied in the engineering work. Lesson: IP is valuable, don t give it away. 57
58 Thank you! 58
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